Algebraic models in different fields
Gaetana Restuccia · Applied Mathematical Sciences · 2014
Dedicated to Professor Marius Stoka on the occasion of his 80th birthday Copyright c © 2014 Gaetana Restuccia. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. We consider a preliminary approach to ranking problems, concerning submodels of the Birkhoff model. Being Sn the symmetric group on the data set {1, 2,..., n}, some results and examples are given for small values of n. 1